Question

The mean of set of no of 3,6,x, 4,3,5,y is given as 5 find the value of x+y

Answer 1

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Mean of certain number of observations is given as

Mean= sum of all observations/number of observations

Here mean is given as 5and the numbers are 3,6,4,3,5,x and y

Substitute these values in the formula.

5= 3+6+4+3+5+x+y/7

5×7= 21+x+y

35-21 = x+y

So, x+y=14

Therefore the answer to your question is 14
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Answer 2

mean = sum of the total observations
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numbers of observations